全国城市三级联动

<div class="info">
    <div>
    <select id="s_province" name="s_province"></select> 
    <select id="s_city" name="s_city" ></select> 
    <select id="s_county" name="s_county"></select>
    <script class="resources library" src="//sandbox.runjs.cn/uploads/rs/267/g3ugugjp/area.js" type="text/javascript"></script>
    
    <script type="text/javascript">_init_area();</script>
    <!--页面初始化的时候需要调用一次_init_area()-->
    </div>
    <div id="show"></div>
</div>
    <script type="text/javascript">
    var Gid  = document.getElementById;
    console.dir(Gid);
    var showArea = function(){
        Gid('show').innerHTML = "<h3>省" +
        Gid('s_province').value + " - 市" +
        Gid('s_city').value + " - 县/区" +
        Gid('s_county').value + "</h3>"
    }
    Gid('s_county').setAttribute('onchange','showArea()');
    </script>